Explosion-proof valve and automobile battery

Abstract

The utility model discloses an explosion -proof valve and car battery. The utility model discloses an explosion -proof valve including main part, first membrane paper, movable assembly, second membrane paper and elastic part. The main part has first air -permeable mouth and second air -permeable mouth, and movable assembly has first air -permeable channel. Second membrane paper is connected in movable assembly and is arranged between first membrane paper and first air -permeable channel. One end of elastic piece abuts the inner wall of main part, and the other end of elastic piece abuts the side of movable assembly away from second air -permeable mouth. When the battery inside thermal runaway, gas enters the main part from second air -permeable channel and is discharged from first air -permeable mouth after passing first membrane paper to realize exhaust, realizes the design of different air inlet channel and exhaust channel in explosion -proof valve, and first air -permeable channel and second membrane paper are integrated on movable assembly, compared with the completely independent double -channel design in prior art, can effectively simplify structure complexity degree, promotes explosion -proof valve internal space utilization.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof valve technology, specifically to an explosion-proof valve and an automotive battery. Background Technology

[0002] To improve the safety performance of battery packs and prevent the risk of explosion caused by the generation of large amounts of gas during battery thermal runaway, explosion-proof valves are usually installed on battery packs. The explosion-proof valves need to be able to vent gas in time during thermal runaway, while maintaining a certain gas flow function under normal conditions to maintain stable internal and external pressure of the battery. Some related technologies have explosion-proof valve designs with dual gas channels, where the inlet and outlet channels are designed separately according to requirements. However, the dual-channel explosion-proof valves in related technologies have the problem of complex internal structure. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an explosion-proof valve that has different air inlet and exhaust channels while simplifying the internal structure of the explosion-proof valve.

[0004] This utility model also proposes an automotive battery having the aforementioned explosion-proof valve.

[0005] An explosion-proof valve according to a first aspect of the present invention includes a main body, a first diaphragm, a movable component, a second diaphragm, and an elastic element. The main body has a first vent and a second vent, and the first diaphragm is disposed between the first vent and the second vent. The movable component is disposed between the first diaphragm and the second vent, and has a first venting channel. When gas flows from the first vent to the second vent, the first venting channel opens; when gas flows from the second vent to the first vent, the first venting channel closes. The second diaphragm is connected to the movable component and disposed between the first diaphragm and the first venting channel. One end of the elastic element abuts against the inner wall of the main body, and the other end abuts against the side of the movable component away from the second vent. The elastic force of the elastic element is used to drive the movable component to block the second vent. When the gas pressure flowing from the second vent to the first vent is greater than the elastic force of the elastic element, the movable component moves away from the second vent to form the second venting channel.

[0006] The explosion-proof valve according to the present invention has at least the following beneficial effects: the dual-channel design in the prior art usually involves setting two different gas flow structures in the explosion-proof valve for gas intake and exhaust respectively. However, the two completely independent structures make the internal structure of the explosion-proof valve complex and the space utilization rate low. In this embodiment of the explosion-proof valve, under normal conditions, external gas enters the main body through the first vent, passes through the first membrane paper for preliminary filtration, and then passes through the second membrane paper and the one-way first venting channel. Finally, it enters the battery containing the explosion-proof valve through the second vent, achieving internal and external pressure balance. However, when the battery experiences thermal runaway, the gas cannot enter the main body through the one-way first venting channel. Under pressure, it resists the elastic force of the elastic element, thus pushing open the movable component to form the second venting channel. The gas enters the main body through the second venting channel, passes through the first membrane paper, and then exits through the first vent to achieve exhaust. Therefore, the explosion-proof valve implements different inlet and outlet channels, and integrates the first venting channel and the second membrane paper on the movable component. Compared with the completely independent dual-channel design in the prior art, this effectively simplifies the structural complexity and improves the internal space utilization of the explosion-proof valve.

[0007] According to some embodiments of the present invention, the active component includes a first component and a second component. The first component includes a ring portion and a core portion connected to each other. The ring portion is sleeved on the outer periphery of the core portion and is used to abut against the main body. The core portion has a mounting groove. The second component and the second membrane paper are disposed in the mounting groove. The first air permeable channel is located in the second component.

[0008] According to some embodiments of the present invention, the second component is a valve component, which includes a first wall and a second wall with elasticity. When gas flows from the first vent to the second vent, the first wall and the second wall open to form the first venting channel. When gas flows from the second vent to the first vent, the first wall and the second wall close to close the first venting channel.

[0009] According to some embodiments of the present invention, the explosion-proof valve includes a sealing ring located between the ring portion and the inner wall of the main body. When the ring portion abuts against the main body, the sealing ring abuts against both the ring portion and the inner wall of the main body.

[0010] According to some embodiments of the present invention, the first membrane paper and the second membrane paper are waterproof and breathable membranes, and the air permeability of the first membrane paper is greater than that of the second membrane paper.

[0011] According to some embodiments of the present invention, the main body includes a face cover and a housing, the face cover being detachably connected to the housing, and the first film paper being disposed between the face cover and the housing.

[0012] According to some embodiments of the present invention, the cover includes an interconnected body portion and a reinforcing rib. The body portion has a vent cavity, the reinforcing rib is disposed in the vent cavity and protrudes relative to the surface of the vent cavity, the reinforcing rib abuts against the housing so that the body portion and the housing are spaced apart, and the gap between the body portion and the housing forms the first vent.

[0013] According to some embodiments of the present invention, the main body further includes a pressure plate, which is disposed inside the housing and located between the first film paper and the second film paper. The end of the elastic member away from the movable component abuts against the pressure plate. The pressure plate has a plurality of first through holes along the thickness direction so that gas can flow between the first vent and the second vent.

[0014] According to some embodiments of the present invention, the housing has a plurality of second through holes on the side surface opposite to the movable component, and the plurality of second through holes form the second vent.

[0015] The automotive battery according to the second aspect of the present invention includes the explosion-proof valve described in any one of the first aspect embodiments.

[0016] The automotive battery according to the present invention has at least the following beneficial effects: Under normal conditions, the explosion-proof valve of the present invention allows external gas to enter the main body through the first vent and the first membrane paper after preliminary filtration. The gas then passes through the second membrane paper and the one-way first venting channel, finally entering the battery interior where the explosion-proof valve is located through the second vent, achieving internal and external pressure balance. However, in the event of thermal runaway within the battery, the gas cannot enter the main body through the one-way first venting channel. Under pressure, it resists the elastic force of the elastic element, thus pushing open the movable component to form the second venting channel. The gas then enters the main body through the second venting channel, passes through the first membrane paper, and exits through the first vent to achieve exhaust. Therefore, the explosion-proof valve incorporates different intake and exhaust channels, integrating the first venting channel and the second membrane paper onto the movable component. Compared to the completely independent dual-channel design in the prior art, this effectively simplifies the structural complexity, improves the internal space utilization of the explosion-proof valve, and reduces the space occupied by the explosion-proof valve within the battery, thereby increasing energy density.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is an exploded view of an explosion-proof valve in one embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of the air intake process of the explosion-proof valve in one embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional view of the venting process of the explosion-proof valve in one embodiment of the present invention.

[0022] Reference numerals: explosion-proof valve 100, first diaphragm 101, movable component 102, second diaphragm 103, elastic element 104, sealing ring 105, face cover 106, housing 107, pressure plate 108, first component 109, second component 110, venting cavity 111, body part 112, reinforcing rib 113, first through hole 114, second through hole 115, first vent 201, second vent 202, first venting channel 203, ring part 204, core part 205, first wall 206, second wall 207, mounting groove 208, main body 209, second venting channel 301. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] To improve the safety performance of battery packs and prevent the risk of explosion caused by the generation of large amounts of gas during battery thermal runaway, explosion-proof valves 100 are usually installed on battery packs. The explosion-proof valve 100 needs to be able to vent gas in time during thermal runaway, and maintain a certain gas flow function under normal conditions to maintain stable internal and external pressure of the battery. Some related technologies have explosion-proof valve 100 designs with dual gas channels, with some paths of the air intake channel and the air exhaust channel designed separately according to requirements. However, the dual-channel explosion-proof valve 100 in related technologies has the problem of complex internal structure.

[0029] This utility model proposes an explosion-proof valve 100, which has dual channels and simplifies the internal structure.

[0030] refer to Figures 1 to 3 According to a first aspect embodiment of the present invention, an explosion-proof valve 100 includes a main body 209, a first diaphragm 101, a movable component 102, a second diaphragm 103, and an elastic element 104. The main body 209 has a first vent 201 and a second vent 202, and the first diaphragm 101 is disposed between the first vent 201 and the second vent 202. The movable component 102 is disposed between the first diaphragm 101 and the second vent 202, and has a first venting channel 203. When gas flows from the first vent 201 to the second vent 202, the first venting channel 203 opens; when gas flows from the second vent 202 to the first vent 201, the first venting channel 203 closes. The second diaphragm 103 is connected to the movable component 102 and disposed between the first diaphragm 101 and the first venting channel 203. One end of the elastic member 104 abuts against the inner wall of the main body 209, and the other end of the elastic member 104 abuts against the side of the movable component 102 away from the second vent 202. The elastic force of the elastic member 104 is used to drive the movable component 102 to block the second vent 202. When the gas pressure flowing from the second vent 202 to the first vent 201 is greater than the elastic force of the elastic member 104, the movable component 102 moves away from the second vent 202 to form the second vent channel 301.

[0031] Existing dual-channel designs typically involve two different gas flow structures within the explosion-proof valve 100 for separate intake and exhaust. However, these two completely independent structures result in a complex internal structure and low space utilization for the explosion-proof valve 100. In this embodiment, the explosion-proof valve 100 allows external gas to enter the main body 209 through the first vent 201 after initial filtration by the first membrane 101. The gas then passes through the second membrane 103 and the unidirectional first vent channel 203, finally entering the battery containing the explosion-proof valve 100 through the second vent 202, achieving internal and external pressure balance. During thermal runaway of the battery, gas cannot enter the main body 209 through the unidirectional first vent channel 203. Under pressure, the gas resists the elastic force of the elastic element 104, thus preventing the explosion-proof valve from entering the battery. The movable component 102 opens to form a second ventilation channel 301. Air enters the main body 209 through the second ventilation channel 301 and passes through the first membrane paper 101 before being discharged from the first vent 201 to achieve exhaust. Therefore, the explosion-proof valve 100 has different air inlet and exhaust channels. Furthermore, the first ventilation channel 203 and the second membrane paper 103 are integrated on the movable component 102. Compared with the completely independent dual-channel design in the prior art, this design can effectively simplify the structural complexity and improve the utilization rate of the internal space of the explosion-proof valve 100.

[0032] It should be noted that the reference Figure 2 In some embodiments of this utility model, the complete air intake channel is as follows: gas enters the interior of the housing 107 through the first vent 201 formed by the gap between the face cover 106 and the housing 107. During this process, it passes through the first membrane paper 101 set between the face cover 106 and the pressure plate 108. Since the elastic member 104 holds the movable component 102, the second vent channel 301 is normally closed. Therefore, after the gas enters the interior of the housing 107, it passes through the second membrane paper 103 set in the mounting groove 208, and then flows into the battery through the second vent 202 at the bottom of the second housing 107 via the first vent channel 203, forming a pressure balance. Therefore, under normal conditions, the gas entering the battery passes through the first membrane paper 101 and the second membrane paper 103. The design of the two membrane papers is conducive to secondary filtration of external water vapor and impurities, preventing external liquids and other impurities from entering the battery, ensuring pressure balance, and also ensuring the performance and quality of the battery.

[0033] refer to Figure 3In some embodiments of this utility model, the complete exhaust channel is as follows: After thermal runaway occurs inside the battery, the gas expands from the inside to the outside to generate air pressure. Since the first vent 203 is a one-way channel, it is in a closed state. The gas impacts upward through the second vent 202. When the air pressure is greater than the elastic force of the elastic member 104, it will push the movable component 102 upward. The gap between the movable component 102 and the shell 107 forms the second vent 301. The gas from thermal runaway enters the interior of the shell 107 through the second vent 301, and after passing through the first membrane paper 101, it is ejected from the first vent 201 to achieve exhaust and pressure relief. Therefore, the gas exhaust during thermal runaway only passes through the first membrane paper 101. The exhaust channel of the single membrane paper can improve the exhaust efficiency and avoid the low exhaust efficiency caused by two membrane papers, thereby preventing the risk of battery explosion. In addition, the first membrane paper 101 can also prevent the exhaust of toxic fumes generated by thermal runaway inside the battery for a certain period of time, thereby preventing solid particles from flowing into the environment such as the driver's cab, thus improving the safety of the battery during thermal runaway.

[0034] refer to Figure 1 and Figure 2 In some embodiments of this utility model, the active component 102 includes a first component 109 and a second component 110. The first component 109 includes an interconnected ring portion 204 and a core portion 205. The ring portion 204 is sleeved on the outer periphery of the core portion 205 and is used to abut against the main body 209. The core portion 205 has a mounting groove 208. The second component 110 and the second membrane paper 103 are disposed in the mounting groove 208. The first ventilation channel 203 is located in the second component 110. This design enhances the structural flexibility of the active component 102. The core 205 is provided with a mounting groove 208 to provide space for the second component 110 and the second membrane 103, while the ring 204 can match the shape inside the housing 107 to achieve contact. In some embodiments, the first component 109 can be provided with different rings 204 according to the shape of the housing 107. The core 205 can place the second component 110 and the second membrane 103 while avoiding the position of the elastic member 104. One end of the elastic member 104 can abut against the side surface of the ring 204 away from the second vent 202, thereby improving the utilization rate of the space inside the housing 107 and reducing the overall size of the explosion-proof valve 100.

[0035] refer to Figure 1 and Figure 2In some embodiments of this utility model, the second component 110 is a valve component, which includes an elastic first wall 206 and a second wall 207. When gas flows from the first vent 201 to the second vent 202, the first wall 206 and the second wall 207 open to form a first venting channel 203. When gas flows from the second vent 202 to the first vent 201, the first wall 206 and the second wall 207 close to shut off the first venting channel 203. The shape of the first wall 206 and the second wall 207 of the valve component gives it a unidirectional flow function, allowing gas to flow in only one direction at a time. Figure 2 The flow pattern shown is from top to bottom, and its elasticity under normal conditions allows it to close automatically. Gas can only push the first wall 206 and the second wall 207 apart when the pressure inside the battery is lower than the external atmospheric pressure by a certain value. This avoids gas flow under isobaric conditions, reducing unnecessary filtration and loss processes in the first and second membrane papers 101 and 103. Furthermore, the valve component has a simple structure and various sizes, and can be customized according to the dimensions of the housing 107 and the mounting groove 208, offering strong adaptability. It can also be manufactured using various materials such as silicone and rubber according to requirements.

[0036] It should be noted that in some embodiments of this utility model, the second component 110 can also use a one-way structure composed of a spring and a baffle. The spring force is used to close the first ventilation channel 203 under normal conditions. When the internal and external pressure difference is greater than a set value, the gas can push open the baffle and flow to the second ventilation port 202. The arrangement direction of the spring and the baffle is opposite to the arrangement direction of the elastic element 104 and the movable component 102 in the embodiments of this utility model. The shape of the mounting groove 208 can be adjusted according to the requirements to adapt to the above one-way structure.

[0037] refer to Figure 1 and Figure 2 In some embodiments of this utility model, the explosion-proof valve 100 includes a sealing ring 105, which is located between the ring portion 204 and the inner wall of the main body 209. When the ring portion 204 abuts against the main body 209, the sealing ring 105 abuts against both the ring portion 204 and the inner wall of the main body 209. The sealing ring 105 can prevent gas from entering the main body 209 under normal conditions and flowing through the gap between the main body 209 and the ring portion 204 to the second vent 202, thereby avoiding the second membrane paper 103. This ensures that the gas entering the battery is filtered by the first membrane paper 101 and the second membrane paper 103, thereby improving the purity of the gas and reducing the pollution of the internal environment of the battery by external gas.

[0038] In some embodiments of this invention, the first membrane paper 101 and the second membrane paper 103 are waterproof and breathable membranes, with the first membrane paper 101 having a higher air permeability than the second membrane paper 103. The waterproof and breathable membrane refers to an ePTFE membrane or other polymer microporous membranes. By controlling the gaps between molecules within the membrane, it achieves air permeability while also providing waterproofing and blocking solid impurities such as dust. This prevents liquid intrusion while allowing gas to pass through, maintaining pressure balance and not affecting the pressure relief function. The first membrane paper 101 not only filters incoming air but also participates in filtering out gas leaks from the battery. This prevents the leakage of electrolyte, toxic substances, etc., and in the event of battery thermal runaway, it can prevent the release of toxic particles immediately, improving the safety of the battery system in the initial stages of thermal runaway and buying time for emergency response. The reason why the air permeability of the first membrane paper 101 is designed to be greater than that of the second membrane paper 103 is that the first membrane paper 101 participates in both the filtration of incoming air and the filtration of outgoing air. The higher air permeability can ensure the efficiency of gas discharge in the event of thermal runaway of the battery, avoiding the risk of secondary expansion or explosion of the battery due to excessively slow pressure relief. The second membrane paper 103 only participates in the filtration of incoming air, so its lower air permeability can also give it higher waterproof performance. It can further filter the gas entering the battery, prevent external moisture and impurities from entering the battery, and improve battery quality.

[0039] refer to Figures 1 to 3 In some embodiments of this utility model, the main body 209 includes a face cover 106 and a housing 107. The face cover 106 is detachably connected to the housing 107, and the first membrane paper 101 is disposed between the face cover 106 and the housing 107. This design facilitates the installation and replacement of the first membrane paper 101. As the filtration performance of the first membrane paper 101 decreases over time, the main body 209 is split into a face cover 106 and a housing 107. When the first membrane paper 101 needs to be replaced, only the face cover 106 needs to be disassembled, which is more convenient in terms of process. Furthermore, the split design allows for adjustment of the shape of the face cover 106 or the housing 107 to accommodate different batteries as needed.

[0040] refer to Figures 1 to 3In some embodiments of this utility model, the face cover 106 includes a body portion 112 and a reinforcing rib 113 connected to each other. The body portion 112 has a venting cavity 111. The reinforcing rib 113 is disposed in the venting cavity 111 and protrudes relative to the surface of the venting cavity 111. The reinforcing rib 113 abuts against the housing 107 so that the body portion 112 and the housing 107 are spaced apart. The gap between the body portion 112 and the housing 107 forms a first vent 201. The design of the reinforcing rib 113 is such that after the face cover 106 is installed on the main body 209, the body portion 112 will have a gap with the housing 107 in both the axial and radial directions due to the presence of the reinforcing rib 113. Thus, the venting cavity 111 has a large gas flow space, which facilitates the gas to enter the venting cavity 111 in various directions along the outer periphery and then flow into the housing 107 or be discharged from the inside of the housing 107 after passing through the first membrane paper 101. The structure is not more complicated, and the first membrane paper 101 is not directly exposed to the external environment.

[0041] refer to Figure 1 and Figure 2 In some embodiments of this utility model, the main body 209 further includes a pressure plate 108, which is disposed within the housing 107 and located between the first film paper 101 and the second film paper 103. The end of the elastic member 104 away from the movable component 102 abuts against the pressure plate 108. The pressure plate 108 has multiple first through holes 114 along its thickness direction to allow gas to flow between the first vent 201 and the second vent 202. The pressure plate 108 facilitates the installation of the elastic member 104; the elastic member 104 can be first placed inside the housing 107 and then pressed and assembled using the pressure plate 108. The multiple first through holes 114 on the pressure plate 108 allow gas to flow smoothly within the housing 107, facilitating gas entry and exit.

[0042] refer to Figure 1 and Figure 2 In some embodiments of this utility model, a plurality of second through holes 115 are provided on the side surface of the housing 107 opposite to the movable component 102, and the plurality of second through holes 115 form a second vent 202. The provision of a plurality of second through holes 115 can improve the gas flow efficiency, prevent the gas from not being able to be discharged in time during thermal runaway, and the method of opening the holes can be further simplified in structure, without the need for more components.

[0043] According to a second aspect embodiment of the present invention, an automotive battery includes the explosion-proof valve 100 of any one of the first aspect embodiments. In this embodiment, under normal conditions, external gas enters the main body 209 through the first vent 201 after preliminary filtration by the first membrane 101, and then passes through the second membrane 103 and the one-way first vent channel 203, finally entering the battery interior where the explosion-proof valve 100 is located through the second vent 202, achieving internal and external pressure balance. However, in the event of thermal runaway within the battery, gas cannot enter the main body 209 through the one-way first vent channel 203. Under pressure, it resists the elastic force of the elastic member 104, thereby pushing open the movable component 102 to form the second vent channel 301. The air enters the main body 209 through the second venting channel 301 and passes through the first membrane paper 101 before being discharged through the first vent 201 to achieve exhaust. Therefore, the explosion-proof valve 100 has different intake and exhaust channels. Furthermore, the first venting channel 203 and the second membrane paper 103 are integrated on the movable component 102. Compared with the completely independent dual-channel design in the prior art, this design can effectively simplify the structural complexity, improve the internal space utilization of the explosion-proof valve 100, and reduce the space occupied by the explosion-proof valve 100 inside the battery, thereby increasing the energy density.

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. An explosion-proof valve, characterized in that, include: The main body has a first vent and a second vent; A first membrane paper is disposed between the first air vent and the second air vent; An active component is disposed between the first membrane paper and the second vent. The active component has a first venting channel. When gas flows from the first vent to the second vent, the first venting channel opens. When gas flows from the second vent to the first vent, the first venting channel closes. A second membrane paper is connected to the movable component and disposed between the first membrane paper and the first air-permeable channel; An elastic element is provided, with one end abutting against the inner wall of the main body and the other end abutting against the side of the movable component away from the second vent. The elastic force of the elastic element is used to drive the movable component to block the second vent. When the gas pressure flowing from the second vent to the first vent is greater than the elastic force of the elastic element, the movable component moves away from the second vent to form a second venting channel.

2. The explosion-proof valve according to claim 1, characterized in that, The active component includes a first component and a second component. The first component includes an interconnected ring and a core. The ring is sleeved on the outer periphery of the core and is used to abut against the main body. The core has a mounting groove. The second component and the second membrane paper are disposed in the mounting groove. The first air permeable channel is located in the second component.

3. The explosion-proof valve according to claim 2, characterized in that, The second component is a valve component, which includes a first wall and a second wall that are elastic. When gas flows from the first vent to the second vent, the first wall and the second wall open to form the first venting channel. When gas flows from the second vent to the first vent, the first wall and the second wall close to shut off the first venting channel.

4. The explosion-proof valve according to claim 2, characterized in that, The explosion-proof valve includes a sealing ring located between the ring portion and the inner wall of the main body. When the ring portion abuts against the main body, the sealing ring abuts against both the ring portion and the inner wall of the main body.

5. The explosion-proof valve according to claim 1, characterized in that, The first membrane paper and the second membrane paper are waterproof and breathable membranes, and the air permeability of the first membrane paper is greater than that of the second membrane paper.

6. The explosion-proof valve according to claim 1, characterized in that, The main body includes a face cover and a housing, the face cover being detachably connected to the housing, and the first film paper being disposed between the face cover and the housing.

7. The explosion-proof valve according to claim 6, characterized in that, The cover includes an interconnected body portion and a reinforcing rib. The body portion has a vent cavity. The reinforcing rib is disposed in the vent cavity and protrudes relative to the surface of the vent cavity. The reinforcing rib abuts against the housing so that the body portion and the housing are spaced apart. The gap between the body portion and the housing forms the first vent.

8. The explosion-proof valve according to claim 6, characterized in that, The main body also includes a pressure plate disposed inside the housing. The pressure plate is located between the first film paper and the second film paper. The end of the elastic member away from the movable component abuts against the pressure plate. The pressure plate has a plurality of first through holes along the thickness direction so that gas can flow between the first vent and the second vent.

9. The explosion-proof valve according to claim 6, characterized in that, The housing has multiple second through holes on the side surface opposite to the movable component, and the multiple second through holes form the second vent.

10. An automotive battery, characterized in that, The explosion-proof valve includes any one of claims 1 to 9.

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